function getXmlHttp()
{
    var xmlhttp;
    try 
    {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } 
    catch (e) 
    {
        try 
        {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } 
        catch (E) 
        {
            xmlhttp = false;
        }

    }

    if (!xmlhttp && typeof XMLHttpRequest!='undefined') 
    {
        xmlhttp = new XMLHttpRequest();
    }
    return xmlhttp;
}


